*{
    margin: 0;
    padding: 0;
}
.content ul .content_span {
    margin-bottom: 20px;
}
.content ul li span {
    font-size: 30px;
    text-shadow: -3px -3px 15px rgba(197, 233, 255,0.8);
    font-family: "微软雅黑";
}
.content ul {
    width: 50%;
    height: 600px;
    position: absolute;
    left: 50%;
    top: 50%;
    margin-left: -30%;
    margin-top:-250px; 
}
.content ul li {
    width: 800px;
    height: 50px;
    margin-left: 300px;
    color:white;
    font-size: 25px;
    font-weight: 100;
}
.content ul .message_notes {
    font-size: 13px;
    color: red;
}
.content ul li input {
    width: 300px;
    height: 30px;
}
.content ul .message_board input{
    width: 500px;
    height: 200px;
}
.content .message_btn {
    position: absolute;
    margin-top:25%;
    margin-left: 50%;
}
.message_btn  .message_btn_con {
    width:150px;
    height: 50px;
    background: rgba(195, 213, 225);
    border: 3px solid rgba(195, 213, 225, .5);
    font-size: 22px;
    font-weight: 100;
    color: white;
    cursor: pointer;
}
input::-webkit-input-placeholder {
    color: rgba(195, 213, 225, .8);
    font-weight: lighter;
}
